hacking-on-atom-core.md: Update windows info

Visual Studio 2015, 2017 and 2019 are supported.
Windows 8 SDK or Windows 10 SDK are supported.
Clarified windows-build-tools install instructions.
The latest windows-build-tools will be fine for the foreseeable future
(Even when they default to Visual Studio 2019 some time soon.)

content/hacking-atom/sections/hacking-on-atom-core.md

@@ -97,18 +97,18 @@ In order to build Atom from source, you need to have a number of other requireme
   * The `python.exe` must be available at `%SystemDrive%\Python27\python.exe`. If it is installed elsewhere create a symbolic link to the directory containing the `python.exe` using: `mklink /d %SystemDrive%\Python27 D:\elsewhere\Python27`
 * 7zip (7z.exe available from the command line) - for creating distribution zip files
 * C++ build tools, either:
-  * [Visual C++ Build Tools 2015 or newer](https://visualstudio.microsoft.com/visual-cpp-build-tools/)
-  * [Visual Studio 2015 or newer](https://www.visualstudio.com/downloads/) (Community Edition or better)
-  * [windows-build-tools](https://www.npmjs.com/package/windows-build-tools): `npm install --global --production windows-build-tools@4.0`
+  * [Visual C++ Build Tools 2015, 2017 or 2019](https://visualstudio.microsoft.com/visual-cpp-build-tools/)
+  * [Visual Studio 2015, 2017 or 2019](https://www.visualstudio.com/downloads/) (Community Edition or better)
+  * [windows-build-tools](https://www.npmjs.com/package/windows-build-tools) (From an elevated CMD.exe or Powershell window (right click and "run as Administrator") do: `npm install --global --production windows-build-tools` to install)
 
 
   Also ensure that:
 
   * The default installation folder is chosen so the build tools can find it
   * If using Visual Studio make sure Visual C++ support is selected/installed
-  * If using Visual C++ Build Tools make sure a Windows SDK is selected/installed
+  * If using Visual C++ Build Tools make sure a Windows SDK (Windows 8 SDK or Windows 10 SDK) is selected/installed
   * A `git` command is in your path
-  * Set the `GYP_MSVS_VERSION` environment variable to the Visual Studio/Build Tools version (`2015`, `2017`, etc.) e.g. ``[Environment]::SetEnvironmentVariable("GYP_MSVS_VERSION", "2015", "User")`` in PowerShell (or set it in Windows advanced system settings).
+  * Set the `GYP_MSVS_VERSION` environment variable to the Visual Studio/Build Tools version (`2015`, `2017`, or `2019`.) e.g. ``[Environment]::SetEnvironmentVariable("GYP_MSVS_VERSION", "2015", "User")`` in PowerShell (or set it in Windows advanced system settings).
 
 {{/windows}}
 
@@ -259,7 +259,7 @@ Use [this search](https://github.com/atom/atom/search?q=label%3Abuild-error+labe
 
 * `msbuild.exe failed with exit code: 1`
    * If using **Visual Studio**, ensure you have the **Visual C++** component installed. Go into Add/Remove Programs, select Visual Studio, press Modify, and then check the Visual C++ box.
-   * If using **Visual C++ Build Tools**, ensure you have the **Windows 8 SDK** or **Windows 10 SDK** component installed. Go into Add/Remove Programs, select Visual C++ Build Tools, press Modify and then check the Windows 8/10 SDK box.
+   * If using **Visual C++ Build Tools**, ensure you have the **Windows 8 SDK** or **Windows 10 SDK** component installed. Go into Add/Remove Programs, select Visual C++ Build Tools, press Modify and then check the "Windows 8 SDK" or "Windows 10 SDK" box.
 
 * `script\build` stops with no error or warning shortly after displaying the versions of node, npm and Python
   * Make sure that the path where you have checked out Atom does not include a space. For example, use `C:\atom` instead of `C:\my stuff\atom`.
@@ -278,7 +278,7 @@ Use [this search](https://github.com/atom/atom/search?q=label%3Abuild-error+labe
   * See the next item.
 
 * `error MSB8020: The build tools for Visual Studio 201? (Platform Toolset = 'v1?0') cannot be found.`
-  * Try setting the `GYP_MSVS_VERSION` environment variable to **2015** or **2017** depending on what version of Visual Studio/Build Tools is installed and then `script\clean` followed by `script\build` (re-open the Command Prompt if you set the variable using the GUI).
+  * Try setting the `GYP_MSVS_VERSION` environment variable to **2015**, **2017** or **2019** depending on what version of Visual Studio/Build Tools is installed and then `script\clean` followed by `script\build` (re-open the Command Prompt if you set the variable using the GUI).
 
 * `'node-gyp' is not recognized as an internal or external command, operable program or batch file.`
   * Try running `npm install -g node-gyp`, and run `script\build` again.